/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.dboe.base.block;

import java.nio.ByteBuffer;

import static org.apache.jena.atlas.lib.ByteBufferLib.fill;
import org.junit.Assert;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public abstract class AbstractTestBlockMgr extends Assert {
    static final public int BlkSize  = 256;

    protected BlockMgr      blockMgr = null;

    @Before
    public void before() {
        blockMgr = make();
        blockMgr.beginUpdate();
    }

    @After
    public void after() {
        if ( blockMgr != null ) {
            blockMgr.endUpdate();
            blockMgr.close();
        }
    }

    @Test
    public void file01() {
        long x = blockMgr.allocLimit();
        assertTrue("First allocLimit : " + x, x >= 0);
        // Assume no recycling.
        Block block = blockMgr.allocate(BlkSize);
        assertTrue("Block inside allocate boundary", block.getId() >= x);
        ByteBuffer bb = block.getByteBuffer();
        fill(bb, (byte)1);
        blockMgr.write(block);
        blockMgr.release(block);
    }

    @Test
    public void file02() {
        Block block = blockMgr.allocate(BlkSize);
        ByteBuffer bb = block.getByteBuffer();
        fill(bb, (byte)1);
        long id = block.getId();
        blockMgr.write(block);
        blockMgr.release(block);

        Block block2 = blockMgr.getRead(id);
        ByteBuffer bb2 = block2.getByteBuffer();
        assertEquals(bb2.capacity(), BlkSize);
        assertEquals(bb2.get(0), (byte)1);
        assertEquals(bb2.get(BlkSize - 1), (byte)1);
        blockMgr.release(block2);
    }

    @Test
    public void file03() {
        Block block = blockMgr.allocate(BlkSize);
        ByteBuffer bb = block.getByteBuffer();
        fill(bb, (byte)2);
        long id = block.getId();
        blockMgr.write(block);
        blockMgr.release(block);

        Block block2 = blockMgr.getRead(id);
        ByteBuffer bb2 = block2.getByteBuffer();
        assertEquals(bb2.capacity(), BlkSize);
        assertEquals(bb2.get(0), (byte)2);
        assertEquals(bb2.get(BlkSize - 1), (byte)2);
        blockMgr.release(block2);
    }

    @Test
    public void multiAccess01() {
        Block block1 = blockMgr.allocate(BlkSize);
        Block block2 = blockMgr.allocate(BlkSize);
        long id1 = block1.getId();
        long id2 = block2.getId();

        ByteBuffer bb1 = block1.getByteBuffer();
        ByteBuffer bb2 = block2.getByteBuffer();

        fill(bb1, (byte)1);
        fill(bb2, (byte)2);

        blockMgr.write(block1);
        blockMgr.write(block2);
        blockMgr.release(block1);
        blockMgr.release(block2);

        Block block3 = blockMgr.getRead(id1);
        Block block4 = blockMgr.getRead(id2);

        ByteBuffer bb_1 = block3.getByteBuffer();
        ByteBuffer bb_2 = block4.getByteBuffer();

        contains(bb_1, (byte)1);
        contains(bb_2, (byte)2);

        blockMgr.release(block3);
        blockMgr.release(block4);
    }

    protected abstract BlockMgr make();

    protected static void contains(ByteBuffer bb, byte fillValue) {
        for ( int i = 0; i < bb.limit() ; i++ )
            assertEquals("Index: " + i, bb.get(i), fillValue);
    }
}
